公开(公告)号：US20250085664A1

公开(公告)日：2025-03-13

申请号：US18725915

申请日：2022-06-28

Applicant: SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION

Inventor： Byoungho LEE ,  Byounghyo LEE ,  Dongyeon KIM ,  Seungjae LEE ,  Chun CHEN

IPC: G03H1/04 ,  G03H1/02 ,  G03H1/26

Abstract: Provided are a method and apparatus for optimizing a holographic display. The holographic display back-propagates target field data including generating a predicted hologram by a plurality of planes in a depth direction to a complex plane of a space light modulator (SLM), converts the predicted hologram into a binary hologram, generates predicted field data by forward-propagating the binary hologram to a reproduction plane through an optical system simulation model, calculates a loss function between the predicted field data and the target field data, generates a new predicted hologram for the predicted field data by using a stochastic gradient descent (SGD) method to reduce a value of the loss function, and repeats the generation of the new predicted hologram until the value of the loss function is less than a predefined threshold.

公开(公告)号：US20250028281A1

公开(公告)日：2025-01-23

申请号：US18737648

申请日：2024-06-07

Applicant: SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION

Inventor： Yoonchan JEONG ,  Seung-Woo NAM ,  Youngjin KIM ,  Dongyeon KIM

IPC: G03H1/22 ,  B82Y20/00 ,  G03H1/00 ,  G03H1/32

Abstract: A holographic display using a metasurface and a metasurface optimization method are provided, wherein the holographic display includes a spatial light modulator, a half-wave plate configured to rotate a linear polarization direction of light incident from the spatial light modulator at a certain angle and output light including a horizontal linear polarization component and a vertical linear polarization component having a same magnitude and orthogonal to each other, and a metasurface including nanostructures configured to perform different phase modulations on the horizontal linear polarization component and the vertical linear polarization component, and the metasurface is optimized by using a gradient descent method.